ACCUMULO-378 Jenkins fix -- retry if we get a security exception because the grant on the replication table didn't happen yet
ACCUMULO-378 Removing experimental annotation.

In talking to [~ctubbsii] on the subject, he stated that the intent of Experimental
was for features that are incomplete or not expected to fully work. Replication is
not one of those features (it is tested and expected to work with known functionality),
therefore I'm removing the experimental annotation.
ACCUMULO-378 Try to reduce the spam in the logs when the peer is unavailable.

Increase the sleep time at a linear scale when we fail to talk to the replication
coordinator. Eventually, bail out completely and let the replication process
take over again.
ACCUMULO-378 Set a more realistic maximum size on the distributed work queue for work assignment.